 However, an eruption is not expected in the near future.Glacier Peak last erupted about 200–300 years ago and has erupted about six times in the past 4,000 years.Mount Rainier last erupted between 1824 and 1854, but many eyewitnesses reported eruptive activity in 1858, 1870, 1879, 1882, and in 1894 as well.